[8][9] On July 12, 2013, he announced that he would seek the Republican nomination for the United States Senate election in 2014.

[12] Megan Creeden, a legislative intern, accused Baumgardner of sexual harassment in which he slapped her butt and of making inappropriate comments.

[16] The Democratic members of the state senate attempted to have Baumgardner expelled, but it failed in a seventeen to seventeen vote, below the twenty-four votes needed, which Senator Don Coram (R) called a "public lynching".

[17] Two other complaints which alleged that Baumgardner created a hostile and offensive work environment and of inappropriate actions with a female intern were verified by an outside investigation.

[19] He announced that he would be leaving the state senate after the additional allegations came out and resigned on January 21, 2019.